Upgrading Unity3d project

I have made a game that has main focus on facial expressions. I have added three emotions (smiley, sad and surprise). I have one main character which is moving on all sides. The idea of the game is to focus on the facial expressions. So my idea is to make three spheres with material (smiley, sad emoticon, surprised emoticon). I have added them. The score of the game is updated if: The main character enter in collision or triger with the sad sphere for example and in if the [login to view URL] > 50. Then the sphere with sad smiley will be destroyed and the score will be 1. Also for the other spheres. What I want from you: Make random balls(spheres) with different smiley on them to fall on different place of the map on some period. To make object to collect them and to update the score. Also to add timer and if it is for example 20sec. After 20 sec result to be shown and button restart or go to main menu. I have made some scene for the menu but you can change it. You can change everything but to keep the facial expressions. Also you can delete anything that is not used and make DESIGN changes for sure.